CVE-2026-33811
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go standard library | net | 0 < 1.25.10 | affected |
| Go standard library | net | 1.26.0-0 < 1.26.3 | affected |
Weaknesses
- CWE-415: Double Free
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME
Additional References
- https://access.redhat.com/security/cve/CVE-2026-33811
- https://bugzilla.redhat.com/show_bug.cgi?id=2467822
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33811.json
- https://access.redhat.com/errata/RHSA-2026:42079
- https://access.redhat.com/errata/RHSA-2026:41019
- https://access.redhat.com/errata/RHSA-2026:54191
- https://access.redhat.com/errata/RHSA-2026:42078
- https://access.redhat.com/errata/RHSA-2026:50319
- https://access.redhat.com/errata/RHSA-2026:54757
- https://access.redhat.com/errata/RHSA-2026:54552
- https://access.redhat.com/errata/RHSA-2026:42082
- https://access.redhat.com/errata/RHSA-2026:50336
- https://access.redhat.com/errata/RHSA-2026:48151
- https://access.redhat.com/errata/RHSA-2026:36796
- https://access.redhat.com/errata/RHSA-2026:39810
- https://access.redhat.com/errata/RHSA-2026:42150
- https://access.redhat.com/errata/RHSA-2026:42151
- https://access.redhat.com/errata/RHSA-2026:42240
- https://access.redhat.com/errata/RHSA-2026:49703
- https://access.redhat.com/errata/RHSA-2026:53413
- https://access.redhat.com/errata/RHSA-2026:54168
- https://access.redhat.com/errata/RHSA-2026:51187
- https://access.redhat.com/errata/RHSA-2026:39272
- https://access.redhat.com/errata/RHSA-2026:35832
- https://access.redhat.com/errata/RHSA-2026:34357
- https://access.redhat.com/errata/RHSA-2026:42946
- https://access.redhat.com/errata/RHSA-2026:39573
- https://access.redhat.com/errata/RHSA-2026:38504
- https://access.redhat.com/errata/RHSA-2026:39266
- https://access.redhat.com/errata/RHSA-2026:36776
- https://access.redhat.com/errata/RHSA-2026:53412
- https://access.redhat.com/errata/RHSA-2026:53415
- https://access.redhat.com/errata/RHSA-2026:39319
- https://access.redhat.com/errata/RHSA-2026:36617
- https://access.redhat.com/errata/RHSA-2026:34359
- https://access.redhat.com/errata/RHSA-2026:47952
- https://access.redhat.com/errata/RHSA-2026:56340
- https://access.redhat.com/errata/RHSA-2026:50843
- https://access.redhat.com/errata/RHSA-2026:34364
- https://access.redhat.com/errata/RHSA-2026:41030
- https://access.redhat.com/errata/RHSA-2026:44622
- https://access.redhat.com/errata/RHSA-2026:47149
- https://access.redhat.com/errata/RHSA-2026:53530
- https://access.redhat.com/errata/RHSA-2026:51033
- https://access.redhat.com/errata/RHSA-2026:43692
- https://access.redhat.com/errata/RHSA-2026:54500
- https://access.redhat.com/errata/RHSA-2026:51057
- https://access.redhat.com/errata/RHSA-2026:57191
- https://access.redhat.com/errata/RHSA-2026:36319
- https://access.redhat.com/errata/RHSA-2026:36625
- https://access.redhat.com/errata/RHSA-2026:36207
- https://access.redhat.com/errata/RHSA-2026:42132
- https://access.redhat.com/errata/RHSA-2026:33574
- https://access.redhat.com/errata/RHSA-2026:36651
- https://access.redhat.com/errata/RHSA-2026:40945
- https://access.redhat.com/errata/RHSA-2026:40118
- https://access.redhat.com/errata/RHSA-2026:23262
- https://access.redhat.com/errata/RHSA-2026:23264
- https://access.redhat.com/errata/RHSA-2026:54441
- https://access.redhat.com/errata/RHSA-2026:41928
- https://access.redhat.com/errata/RHSA-2026:50300
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/errata/RHSA-2026:42644
- https://access.redhat.com/errata/RHSA-2026:36648
- https://access.redhat.com/errata/RHSA-2026:54556
- https://access.redhat.com/errata/RHSA-2026:54584
- https://access.redhat.com/errata/RHSA-2026:54603
- https://access.redhat.com/errata/RHSA-2026:54602
- https://access.redhat.com/errata/RHSA-2026:35994
- https://access.redhat.com/errata/RHSA-2026:35995
- https://access.redhat.com/errata/RHSA-2026:35993
- https://access.redhat.com/errata/RHSA-2026:33120
- https://access.redhat.com/errata/RHSA-2026:33123
- https://access.redhat.com/errata/RHSA-2026:33142
- https://access.redhat.com/errata/RHSA-2026:33150
- https://access.redhat.com/errata/RHSA-2026:54287
- https://access.redhat.com/errata/RHSA-2026:54284
- https://access.redhat.com/errata/RHSA-2026:54286
- https://access.redhat.com/errata/RHSA-2026:54285
- https://access.redhat.com/errata/RHSA-2026:54274
- https://access.redhat.com/errata/RHSA-2026:54283
- https://access.redhat.com/errata/RHSA-2026:50205
- https://access.redhat.com/errata/RHSA-2026:51341
- https://access.redhat.com/errata/RHSA-2026:51194
- https://access.redhat.com/errata/RHSA-2026:36797
- https://access.redhat.com/errata/RHSA-2026:42043
- https://access.redhat.com/errata/RHSA-2026:42047
- https://access.redhat.com/errata/RHSA-2026:42050
- https://access.redhat.com/errata/RHSA-2026:42051
- https://access.redhat.com/errata/RHSA-2026:42049
- https://access.redhat.com/errata/RHSA-2026:42048
- https://access.redhat.com/errata/RHSA-2026:42852
- https://access.redhat.com/errata/RHSA-2026:54435
- https://access.redhat.com/errata/RHSA-2026:46885
- https://access.redhat.com/errata/RHSA-2026:57194
- https://access.redhat.com/errata/RHSA-2026:41055
- https://access.redhat.com/errata/RHSA-2026:47735
References
- https://go.dev/issue/78803
- https://go.dev/cl/767860
- https://groups.google.com/g/golang-announce/c/qcCIEXso47M
- https://pkg.go.dev/vuln/GO-2026-4981
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